690671 has 4 divisors (see below), whose sum is σ = 693000. Its totient is φ = 688344.

The previous prime is 690661. The next prime is 690673. The reversal of 690671 is 176096.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 690671 - 2⁶ = 690607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 641 + ... + 1338.

It is an arithmetic number, because the mean of its divisors is an integer number (173250).

2⁶⁹⁰⁶⁷¹ is an apocalyptic number.

690671 is a deficient number, since it is larger than the sum of its proper divisors (2329).

690671 is a wasteful number, since it uses less digits than its factorization.

690671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2328.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 690671 is about 831.0661826834. The cubic root of 690671 is about 88.3941940455.

The spelling of 690671 in words is "six hundred ninety thousand, six hundred seventy-one".